DS90UB954-Q1: DS90UB954 only use port1， port0 is empty， how to config registers

Hello Xue,

If port 0 is not used, leave it as NC and set RX_PORT_CTL register bit 0 = 0 to disable this port.

And for setting any required register, you need first to write 0x12 in reg 0x4C, to chose port 1.